Will this interfere with the factory bumper or undertray?

No. This lip uses existing OEM mounting points and is designed to sit flush with the factory bumper line. Verify your vehicle's undertray clearance before installation if aftermarket downforce components are present.

How do I restore the shape if it warps during delivery?

Place the lip in direct sunlight for 30–45 minutes. Polyurethane softens and naturally returns to its original contour when exposed to heat. Do this before handling or installation.

Should I sand this before painting, or apply primer first?

Sand the surface with your preferred grit to remove any mold release agent and create paint adhesion, then apply your primer and topcoat system. The polyurethane substrate accepts most standard automotive finishes.